Customizable AVR ESR Meter Case

This is a simple case for the yellow chinese AVR/Arduino ESR Meter clones.

I've simply cut a M3 thread into three of the four spacers and glued a holder for two 18650 LiIon cells to the bottom.

[Watch my print time-lapse on YouTube](https://www.youtube.com/watch?v=_5Q9g8AQmSk)

**Update** 2016-06-17:

I've added an on-off switch and little helper discs in the corners to prevent warping.